Researchers are using origami to design a robot that could help wheelchair users grasp objects. | Source: WPI
Inspired by origami, Worcester Polytechnic Institute, or WPI, robotics engineering researchers are developing a lightweight, flexible robotic arm. This arm will enable a wheelchair user to safely grasp, lift, and carry objects that would otherwise be out of reach.
“The basic scientific discoveries we are making in this research address real-world challenges for people who use wheelchairs and need devices that will help them grab out-of-reach objects,” said Cagdas Onal, who is the principal investigator on the project and an associate professor in the WPI Department of Robotics Engineering. “A new class of lightweight, safe robotic arms based on the breakthroughs we are making would give those individuals more independence in their daily activities.”
Through the four-year project, researchers Onal, Berk Calli, and Loris Fichera are developing a framework for the design, modeling, and control of soft continuum robotic arms, which are more flexible than traditional robot arms. The research is funded by a $1,314,792 award from the National Science Foundation.
The project builds on Onal’s research into user-friendly soft robotic systems capable of performing tasks that rigid robots cannot tackle. Calli, an associate professor in robotics engineering, brings expertise in object manipulation technologies, especially for robots in recycling centers. Fichera is an assistant professor in robotics engineering whose research includes work on the development of surgical robots.
Soft continuum robotic arms expand, shrink, and bend along their entire length, like a coiled spring, to move in different directions and travel around objects. That flexibility makes soft robotics a promising technology in complicated human environments.
However, soft robotic arms tend to be weaker, shakier, and less precise than traditional robot arms made from rigid materials, acknowledged the institute.
WPI origami techniques address soft robot arm limits
To address the weaknesses of soft robotic arms, the researchers are developing origami-inspired designs and novel fabrication methods for modules made of lightweight plastics, 3D-printed components, and off-the-shelf items such as sensors and cables.
By folding flat sheets of clear plastic into springy tube-like structures, the WPI researchers said they are creating modules that are strong, stiff, and resistant to twisting, all while remaining lightweight. The scientists are also developing specialized algorithms that can run on microcontroller platforms to direct the motion and reactions of a robotic arm.
“Soft robots have big potential for assistive robotics,” said Calli. “You would need a very large, rigid robot to reach the high shelves of a cabinet, for example, and installing such robots next to a user does not make sense.”
“Soft robots could expand to reach objects and shrink to a compact size when not in use, and they would be safer for users than rigid robots,” he added. “Our project will enable soft robotics for assistive uses by developing novel sensing, control, and AI technologies.”
Onal noted that one goal of the institute‘s research is to develop a flexible and extendable robotic arm with off-the-shelf grippers that can pick up and carry a cup of water without spilling a drop.
“It’s exciting to work with WPI colleagues and students on a project that is pushing the boundaries of this technology,” he said. “More importantly, this research offers an opportunity to directly impact people in a positive way by enabling them to lift, move, and carry objects that they previously might not have been able to reach from a wheelchair. That would be a real achievement.”
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